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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Over-heating

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TD 20c

04-01-2005 11:47:00




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I have a TD 20 that likes to run hot, I had the radiator rodded out last summer and changed out both thermostats and temp gauge. But after about an hour of working the temp keeps going up. Am not losing any water, but if you let it idle for about ten minutes the temp goes back to normal. Any suggestions?




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Dresser 20c

04-12-2005 21:22:51




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
Thanks for all the help guys, I would have responded sooner but have been tracking down leaks on the trans/torque(and lost my password). The local dozer mechanic thought the torque was sucking air, heating the oil cooler and tranfering the heat to the radiator. So I replaced a trans line and an O ring and cooled it down quite a bit. The 20c does have a V-8, 573. Never Boggs down but consumes plenty of fuel.

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Heat Houser

04-05-2005 20:06:43




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
Get it up to operating temp to get the thermostat open. Shoot the top radiator tank with an infared heat gun and compare it to the bottom tank. You shouldn't see much more than a 12-15 degree F temp. drop. (Top tank should be the hottest)

If the temp drop (differential) is greater than 12-15, the coolant is moving too slowly thru the radiator. You will need to find out why.

If the drop is less, plugged fins, not enough air flow, warm air is recycling back thru the radiator etc. Look for missing shrouds that would allow recycling. Is the fan shroud installed and in good shape? You need this to optimize fan blade efficiency.

Is the fan installed correctly? If installed backwards, the air will still move the correct way but not with sufficient velocity. The "cup" of the blade needs to be pulling the air, not the curved backside.

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Don Montgomery

04-05-2005 15:30:47




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
I too gave some thought to the "691" and remember that the very early 20's could have had that engine. Sorry to say that they were before my time and I have no experience with that engine.
Thanks Gary for your help.



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Don Montgomery

04-03-2005 18:19:49




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
I can't remember the TD20's ever having a 691 engine. The TD20c had DVT 573 and the TD20e's had DVT800's. I bleive the TD20B had a DT429. Overheating can be a number of problems. Dirty radiator, non-pressured cooling system, bad H20 pump, stalling the converter and hydraulics at the same time and etc. If the head gasket was leaking or a cracked head you should be loosing water. Do you have a V8 engine or a 6 cylinder? Check the fan to see if you can turn it easily without the crank moving. As I recall there was a rubber coupling at one time.

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Gary Mckenzie

04-05-2005 07:02:01




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 Re: Over-heating in reply to Don Montgomery, 04-03-2005 18:19:49  
Don, when I read the original post the first time, I failed to notice the "c" in TD20c, the very first TD 20's in the '50's shared the D691 with the TD 18's (TD20-200 & TD20-201).



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Gary Mckenzie

04-01-2005 15:33:19




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
What engine/trans do you have? The D691 in the 200/201 series were prone to overheating. If it's a later model does it have a transmission cooler incorporated with the radiator? Sometimes a trans or hyd. problem can cause engine overheating as well. Also, check your radiator fins for dirt or excessive paint as this can reduce heat transfer.



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hector gemme

04-01-2005 13:23:36




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
HI DID YOU CHECK FAN BELT.



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seann

04-01-2005 13:19:58




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
My loader was running hot last year as soon as the weather warmed up. My radiator was heavily gunked up with crud/dirt/grease. I used engine cleaner and a pressure washer to completely blast out all the crud. After that I could see light through the other side and feel the fan blowing air through the radiator. Temps dropped to normal after that.

Good luck



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old

04-01-2005 12:59:09




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 Re: Over-heating in reply to TD 20c, 04-01-2005 11:47:00  
Try filling the cooling system with vinegar and run it for an hour or so then drain and flush with water. You may have rust etc. built up in the block slowing down your water flow which will make them run hot.



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